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Re: CF Lighting Recommendations Needed
This is a follow-up of my older post at
http://www.actwin.com/fish/aquatic-plants/month.9903/msg00462.html
In that article I show a quantitative comparison of fluorescent bulbs with
emphasis on plant use. Since them I augmented the database with the
inclusion of more bulb data, including one power compact fluorescent
(Osram/Sylvania Dulux 5400K) and one metal halide (Iwasaki 6500K).
Here is the new complete table, arranged in decreasing order of PAR
output. See the former article for explanations.
Bulb Power Max. Rated Effic. PAR MPAR R/B
(W) lumens lumens total blue red
(1.E15 phot./sec)
Iwasaki65 175 45000 12000 0.27 123. 60.9 26.1 20.4 0.78
Dulux540 55 16000 4800 0.30 42.9 21.1 11.8 5.7 0.48
AX50 40 12000 3600 0.30 31.6 15.5 7.7 5.2 0.68
Triton 40 8000 2200 0.28 27.3 16.4 10.9 3.5 0.32
SP65 40 11700 3050 0.26 26.4 13.5 6.9 3.7 0.53
PowerGlo 40 8500 2200 0.26 25.7 15.8 9.3 3.5 0.37
Daylight Dlx. 40 10400 2550 0.25 25.5 13.2 6.3 4.0 0.64
C50 40 9900 2250 0.23 24.7 12.1 4.1 5.4 1.30
SunGlo 40 13400 3100 0.23 23.9 11.3 5.0 2.8 0.57
Perfecto 40 7300 1600 0.22 23.4 14.4 5.1 7.5 1.47
P&A 40 9200 1900 0.21 23.4 11.1 2.3 6.7 2.88
Osram Biolux 40 10800 2400 0.22 22.5 12.2 5.5 3.1 0.53
GroLux 40 5900 1200 0.20 22.3 14.0 4.2 8.6 2.05
AquaGlo 40 4800 960 0.20 21.4 15.0 5.6 8.4 1.49
FloraGlo 40 12500 2180 0.17 19.2 8.8 1.4 5.1 3.57
TL950 32 12500 2000 0.16 13.4 5.5 1.3 1.5 1.17
Ott CF 23 5400 1200 0.22 12.9 7.6 3.9 2.4 0.62
(Thanks to Roger Miller for identifying an error in the conversion to
photons/sec, and for providing a nice photopic curve and software)
For the two bulbs of interest:
Lumens/watt PAR/watt MPAR/watt
Iwasaki 6500 69 0.70 0.35
Dulux 5400 87 0.78 0.38
The lumens/watt and MPAR/watt measures are sensitive to the particular
spectral distribution created by each bulb, but the PAR/watt is not.
The evidence suggests that CFs can have the same efficiency, or even
be slightly more efficient than MHs, although this can only be said for
sure for the two bulbs analyzed here. The Iwasaki spectrum looks better,
from a plant viewpoint, than the Dulux's triphospor spectrum, though.
-Ivo Busko
Baltimore, MD